I cant say it will cure your problem, but as I to had exhausted all possible problems with calipers etc I changed the flange and it was a massive improvement even with warped discs still on the car.
I bought it from that very supplier. Its not genuine, but did fit fine and I bought a genuine wheel bearing rather than the one he is offering with the flange. He does sell the flange on its own if you want to shop around for your own bearing kit.
Good luck!